Talk:List of hypothetical Solar System objects

Planet X

is Planet x a reall planet —Preceding unsigned comment added by 75.164.239.245 (talk) 02:37, 15 February 2008 (UTC)

Not really. "Planet X" is a term used to describe any hypothetical object beyond Neptune whose existence is inferred through gravitational interaction. Right now there are at least two different "Planet X"-es being discussed in scientific literature, and no one knows whether either of them exist or not. If either of them were to be found, it wouldn't be Planet X anymore, but another Planet X might show up to replace it. So it's probably better thinking of Planet X as a concept, rather than as a planet.Serendi^podous 08:16, 15 February 2008 (UTC)

If you consider if a planet X was discovered, then yes, planet X is real, and it's name is Pluto, but Pluto is no longer a planet. 76.66.198.46 (talk) 10:19, 14 November 2008 (UTC)

No, Pluto is not Planet X. Planet X was a planet large enough to perturb Neptune's orbit, except we now know that Neptune's orbit was not being perturbed, so Planet X doesn't exist. Serendi^podous 09:28, 20 November 2008 (UTC)

Counter-Earth

@Eridian314: I am strongly in favor of the inclusion of Counter-Earth here. While I am against including anything people come up with nowadays without any real justification (These are no hypotheses, these are wild ideas), the idea of counter-earth is 2500 years old, and thus of great historical significance. And for small object, it has even some merit due to the L₃ point. Best regards, MGChecker (talk) 21:59, 24 February 2021 (UTC)

Theia

Should it still be on here? Since there aren't many other alternatives to the formation of the moon Crystallyn0 (talk) 13:48, 2 March 2023 (UTC)